Buttonmen 101

I have 3 choices. What attack gives me the best chance of winning? Or should I go for the draw?

not hard, but illustrative

AD has six possible attacks here -- either of my buttons may be taken by either of his dice, or he may boom attack either of my dice.  He's likely to win in any case, but which attacks give the biggest guarantee? [as if often the case, it's not hard to do the explicit math, but this is a frequent enough sort of occurence that it's worth developing the right intuition.]